My problem.
I have two class Client and Book with relations OneToMany set on cascade
"REMOVE".
Now I must change scope "SESSION" on "CONVERSATION".
Now (after the change) when i execute delete method on Client i have error.
When scope is set on SESSION everything is ok but when is set on CONVERSATION
then I have error. Why? PLEASE HELP!
How it looks:
Client CLASS
| package pl.test.client;
|
| import java.io.Serializable;
| import java.util.HashSet;
| import java.util.Set;
|
| import javax.persistence.CascadeType;
| import javax.persistence.Entity;
| import javax.persistence.GeneratedValue;
| import javax.persistence.Id;
| import javax.persistence.OneToMany;
| import javax.persistence.Table;
|
| import org.jboss.seam.annotations.Name;
|
| @Entity
| @Name("client")
| @Table(name="clients")
| public class Client implements Serializable {
|
| /**
| *
| */
| private static final long serialVersionUID = -3074021688217036261L;
|
| private int id;
| private String name;
| private Set<Investment> books = new HashSet<Investment>();
|
| @Id @GeneratedValue
| public int getId() {
| return id;
| }
| public void setId(int id) {
| this.id = id;
| }
| @OneToMany(cascade=CascadeType.REMOVE, mappedBy="client")
| public Set<Investment> getBooks() {
| return books;
| }
| public void setBooks(Set<Investment> books) {
| this.books = books;
| }
| public String getName() {
| return name;
| }
| public void setName(String name) {
| this.name = name;
| }
| }
|
Book CLASS
| package pl.test.client;
|
| import java.io.Serializable;
|
| import javax.persistence.Entity;
| import javax.persistence.GeneratedValue;
| import javax.persistence.Id;
| import javax.persistence.JoinColumn;
| import javax.persistence.Table;
|
| import org.jboss.seam.annotations.Name;
|
| @Entity
| @Name("book")
| @Table(name="books")
| public class Book implements Serializable{
|
| /**
| *
| */
| private static final long serialVersionUID = 1624659788044987338L;
|
| private int id;
| private String bookname;
| private Client client;
|
| @JoinColumn(name="books")
| public String getBookname() {
| return bookname;
| }
| public void setBookname(String bookname) {
| this.bookname = bookname;
| }
| public Client getClient() {
| return client;
| }
| public void setClient(Client client) {
| this.client = client;
| }
| @Id
| @GeneratedValue
| public int getId() {
| return id;
| }
| public void setId(int id) {
| this.id = id;
| }
| }
|
And MANAGER who i execute
| package pl.test.client;
|
| import static javax.persistence.PersistenceContextType.EXTENDED;
|
| import java.io.Serializable;
| import java.util.List;
|
| import javax.ejb.Remove;
| import javax.ejb.Stateful;
| import javax.persistence.EntityManager;
| import javax.persistence.PersistenceContext;
|
| import org.jboss.seam.annotations.Begin;
| import org.jboss.seam.annotations.Destroy;
| import org.jboss.seam.annotations.End;
| import org.jboss.seam.annotations.Factory;
| import org.jboss.seam.annotations.In;
| import org.jboss.seam.annotations.Logger;
| import org.jboss.seam.annotations.Name;
| import org.jboss.seam.annotations.Out;
| import org.jboss.seam.annotations.datamodel.DataModel;
| import org.jboss.seam.log.Log;
|
| @Stateful
| @Name("clientManager")
| public class ClientManagerBean implements Serializable, ClientManager{
|
| /**
| *
| */
| private static final long serialVersionUID = 6887290828466517147L;
|
| @DataModel
| private List<Client> clientsList;
|
| @In(required = false)
| @Out(required = false)
| private Client client;
|
| @PersistenceContext(type=EXTENDED)
| private EntityManager em;
|
| public void delete() {
| if (client!=null){
| client = em.merge(client);
| clientsList.remove(client);
| em.remove(client);
| client=null;
| }
| }
| @Factory("clientsList")
| public void findClients() {
| clientsList = em.createQuery("from Client
cli").getResultList();
| }
| @Remove
| @Destroy
| public void destroy() {
| }
| }
|
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